Chris Brown just added some “iron” to his stoush with Soulja Boy. The former heavyweight champion of the world, “Iron” Mike Tyson, has promised to train the singer and teach him “every dirty trick in the book.” And that includes ear biting.

Just days after retired prizefighter Floyd Mayweather agreed to train Soulja Boy in preparation for their boxing match, Tyson has stepped into Brown’s corner.

Tyson, the controversial ex-athlete who, at 20, became the youngest-ever heavyweight champ, turned on his best pre-bout trash talk for a clip in which he promises his ward will learn every nasty move from the arsenal, including the chomp he once put on Evander Holyfield’s ear.

“So it’s confirmed,” Tyson says in a video posted to his Instagram account. “I’m training Chris, he chose me as his trainer to take on Soulja Boy. And Soulja Boy, what the fuck you talking about? I’m gonna teach him how to bite somebody’s ear. Yeah, that’s right. I’m gonna teach him every dirty trick in the book to knock you out. I’m not going to teach him how to run.”

The new year got off to a punchy start when Soulja and Brown engaged in an online sparring session which has blown up into a fight proper, with both artists going at it in the ring this March.

In Tyson, Brown has one of world’s hardest men in his camp, a fighter many experts count among the greatest to lace up gloves. In his best-selling 2013 memoir Undisputed Truth, Tyson recounted his troubled upbringing, the critical role of his late mentor and trainer Cus D’Amato, his battles with weight, authority, opponents, drugs and cash, and his fondness for an unexpected performing artist: Barbra Streisand. Tyson flirted with pop music when he contributed vocals to Madonna’sRebel Heart tune “Iconic”.